[Amps] HL2K high input SWR on 21 MHz

[Carl]

Unless tested at rated voltage or even with drive the rest is guesswork.

Carl
KM1H


----- Original Message ----- 
From: "Patrick EGLOFF" <pegloff at gmail.com>
To: <amps at contesting.com>
Sent: Friday, March 04, 2016 1:34 PM
Subject: [Amps] HL2K high input SWR on 21 MHz


> Hi all,
>
> I have a HL2K amplifier (pair of 3-500Z) for several years now (got it
> second hand) and it always had a high input SWR on 21 MHz. I matched it
> with my TS850 antenna tuner, so it was OK.
>
> During last contest i had a problem on 40m (500pF/2kV in output tank
> shorted). So i had to open the amplifier and while being there i wanted to
> see what's wrong with this SWR.
>
> I couldn't reduce the SWR in adjusting the capacitor.
>
> I removed all components used in the input tank and checked them. They are
> all perfect.
> Coil is 0.34uH and caps are as marked and on diagram.. Input C = 150 pF 
> and
> output adjustable up to 200 pF.
>
> So now, i'm stucked....
>
> On all other bands, the input SWR is just fine, so i suppose there is no
> problem with the tubes or anything else in the amp. I have full power and
> everything is stable.
>
> Does anyone have a HL2K and can confirm that it is OK (or not) on 15m ?
>
> Any idea on what could be wrong ?
>
> 73, Patrick
>
> -- 
> Patrick Egloff - TK5EP
> email : pegloff at gmail.com
> Web page : http://www.egloff.eu
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>
> -----
> No virus found in this message.
> Checked by AVG - www.avg.com
> Version: 2015.0.6189 / Virus Database: 4540/11776 - Release Date: 03/08/16
>